Mercurial > noffle

annotate src/wildmat.c @ 180:09ca6eb5c7ff noffle

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[svn] * TODO,src/client.c,src/client.h,src/fetch.c,src/fetch.h,src/noffle.c: Improve error checking during fetches. A fetch is now aborted immediately if the connection times out or if an unexpected response arrives. This should fix problems with articles appearing in the wrong group, and possibly other mysterious happenings.
author bears
date Wed, 09 May 2001 12:33:43 +0100
parents 62b9392bceca
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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43
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1 /*
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2 wildmat.c
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3
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4 Taken from the INN 2.2 distribution and slightly altered to fit the
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5 Noffle environment. Changes are:
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6 o Rename wildmat() to Wld_match().
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7 o Adjust includes.
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8
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9 $Id: wildmat.c 52 2000-05-06 16:53:25Z bears $
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10
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11 The entire INN distribution is covered by the following copyright
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12 notice. As this file originated in the INN distribution is it
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13 subject to the conditions of this notice.
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14
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15 Copyright 1991 Rich Salz.
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16 All rights reserved.
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17 $Revision: 52 $
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18
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19 Redistribution and use in any form are permitted provided that the
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20 following restrictions are are met:
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21 1. Source distributions must retain this entire copyright notice
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22 and comment.
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23 2. Binary distributions must include the acknowledgement ``This
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24 product includes software developed by Rich Salz'' in the
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25 documentation or other materials provided with the
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26 distribution. This must not be represented as an endorsement
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27 or promotion without specific prior written permission.
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28 3. The origin of this software must not be misrepresented, either
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29 by explicit claim or by omission. Credits must appear in the
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30 source and documentation.
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31 4. Altered versions must be plainly marked as such in the source
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32 and documentation and must not be misrepresented as being the
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33 original software.
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34 THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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35 WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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36 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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37
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38 */
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39
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40 /* $Revision: 52 $
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41 **
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42 ** Do shell-style pattern matching for ?, \, [], and * characters.
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43 ** Might not be robust in face of malformed patterns; e.g., "foo[a-"
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44 ** could cause a segmentation violation. It is 8bit clean.
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45 **
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46 ** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
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47 ** Rich $alz is now <rsalz@osf.org>.
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48 ** April, 1991: Replaced mutually-recursive calls with in-line code
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49 ** for the star character.
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50 **
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51 ** Special thanks to Lars Mathiesen <thorinn@diku.dk> for the ABORT code.
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52 ** This can greatly speed up failing wildcard patterns. For example:
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53 ** pattern: -*-*-*-*-*-*-12-*-*-*-m-*-*-*
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54 ** text 1: -adobe-courier-bold-o-normal--12-120-75-75-m-70-iso8859-1
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55 ** text 2: -adobe-courier-bold-o-normal--12-120-75-75-X-70-iso8859-1
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56 ** Text 1 matches with 51 calls, while text 2 fails with 54 calls. Without
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57 ** the ABORT code, it takes 22310 calls to fail. Ugh. The following
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58 ** explanation is from Lars:
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59 ** The precondition that must be fulfilled is that DoMatch will consume
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60 ** at least one character in text. This is true if *p is neither '*' nor
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61 ** '\0'.) The last return has ABORT instead of FALSE to avoid quadratic
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62 ** behaviour in cases like pattern "*a*b*c*d" with text "abcxxxxx". With
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63 ** FALSE, each star-loop has to run to the end of the text; with ABORT
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64 ** only the last one does.
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65 **
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66 ** Once the control of one instance of DoMatch enters the star-loop, that
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67 ** instance will return either TRUE or ABORT, and any calling instance
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68 ** will therefore return immediately after (without calling recursively
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69 ** again). In effect, only one star-loop is ever active. It would be
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70 ** possible to modify the code to maintain this context explicitly,
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71 ** eliminating all recursive calls at the cost of some complication and
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72 ** loss of clarity (and the ABORT stuff seems to be unclear enough by
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73 ** itself). I think it would be unwise to try to get this into a
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74 ** released version unless you have a good test data base to try it out
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75 ** on.
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76 */
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77 #include <stdio.h>
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78 #include <sys/types.h>
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79 #include "common.h"
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80 #include "log.h"
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81 #include "wildmat.h"
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82
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83 #define ABORT (-1)
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84
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85 /* What character marks an inverted character class? */
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86 #define NEGATE_CLASS '^'
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87 /* Is "*" a common pattern? */
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88 #define OPTIMIZE_JUST_STAR
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89 /* Do tar(1) matching rules, which ignore a trailing slash? */
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90 #undef MATCH_TAR_PATTERN
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91
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92
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93 /*
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94 ** Match text and p, return TRUE, FALSE, or ABORT.
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95 */
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96 static int DoMatch(const char *text, const char *p)
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97 {
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98 int last;
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99 int matched;
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100 int reverse;
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101
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102 for ( ; *p; text++, p++) {
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103 if (*text == '\0' && *p != '*')
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104 return ABORT;
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105 switch (*p) {
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106 case '\\':
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107 /* Literal match with following character. */
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108 p++;
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109 /* FALLTHROUGH */
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110 default:
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111 if (*text != *p)
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112 return FALSE;
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113 continue;
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114 case '?':
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115 /* Match anything. */
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116 continue;
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117 case '*':
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118 while (*++p == '*')
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119 /* Consecutive stars act just like one. */
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120 continue;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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121 if (*p == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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122 /* Trailing star matches everything. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
123 return TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
124 while (*text)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
125 if ((matched = DoMatch(text++, p)) != FALSE)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
126 return matched;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
127 return ABORT;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
128 case '[':
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
129 reverse = p[1] == NEGATE_CLASS ? TRUE : FALSE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
130 if (reverse)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
131 /* Inverted character class. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
132 p++;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
133 matched = FALSE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
134 if (p[1] == ']' || p[1] == '-')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
135 if (*++p == *text)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
136 matched = TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
137 for (last = *p; *++p && *p != ']'; last = *p)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
138 /* This next line requires a good C compiler. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
139 if (*p == '-' && p[1] != ']'
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
140 ? *text <= *++p && *text >= last : *text == *p)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
141 matched = TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
142 if (matched == reverse)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
143 return FALSE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
144 continue;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
145 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
146 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
147
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
148 #ifdef MATCH_TAR_PATTERN
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
149 if (*text == '/')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
150 return TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
151 #endif /* MATCH_TAR_ATTERN */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
152 return *text == '\0';
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
153 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
154
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
155
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
156 /*
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
157 ** User-level routine. Returns TRUE or FALSE.
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
158 */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
159 Bool
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
160 Wld_match(const char *text, const char *pattern)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
161 {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
162 #ifdef OPTIMIZE_JUST_STAR
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
163 if (pattern[0] == '*' && pattern[1] == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
164 return TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
165 #endif /* OPTIMIZE_JUST_STAR */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
166 return DoMatch(text, pattern) == TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
167 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
168
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
169
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
170
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
171 #if defined(WILDMAT_TEST)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
172
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
173 /* Yes, we use gets not fgets. Sue me. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
174 extern char *gets();
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
175
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
176
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
177 int
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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parents:
diff changeset
178 main()
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
179 {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
180 char p[80];
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
181 char text[80];
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
182
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
183 printf("Wildmat tester. Enter pattern, then strings to test.\n");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
184 printf("A blank line gets prompts for a new pattern; a blank pattern\n");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
185 printf("exits the program.\n");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
186
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
187 for ( ; ; ) {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
188 printf("\nEnter pattern: ");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
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diff changeset
189 (void)fflush(stdout);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
190 if (gets(p) == NULL || p[0] == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
191 break;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
192 for ( ; ; ) {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
193 printf("Enter text: ");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
194 (void)fflush(stdout);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
195 if (gets(text) == NULL)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
196 exit(0);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
197 if (text[0] == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
198 /* Blank line; go back and get a new pattern. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
199 break;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
200 printf(" %s\n", Wld_match(text, p) ? "YES" : "NO");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
201 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
202 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
203
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
204 exit(0);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
205 /* NOTREACHED */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
206 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
uh1763
parents:
diff changeset
207 #endif /* defined(TEST) */